0. track: store obects on disk- Automatically stores objects in files on disk so that
files are rewritten when objects are changed, and so
that objects are accessible but do not occupy memory until
they are accessed. Also tracks times when objects are created
and modified.

2. dcGOR- dcGOR is a package for analysing domain-centric ontologies and annotations. It includes: enrichment analysis and visualisation; construction of a domain (semantic similarity) network; significance analysis for a contact network.

3. Plot manageable subsets of data- Plotting a large data set is difficult if it does not fit into memory as a data frame, so we introduce more efficient data structures and alternative plot functions that work with large data.